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Vehicle Wiring Details for your
2003-2004 Mercury Grand Marquis Wiring Diagram
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Listed below is the vehicle specific wiring diagram for your car alarm, remote starter or keyless entry installation into your 2003-2004 Mercury Grand Marquis . This information outlines the wires location, color and polarity to help you identify the proper connection spots in the vehicle. Please be sure to test all of your wires with a digital multimeter before making any connections. More information on using a multimeter and testing wires please see our Technical Support Area.


 PART   COLOR  LOCATION
 12 VOLT CONSTANT   BROWN (+) and LIGHT GREEN (+)   @ IGNITION SWITCH HARNESS
 STARTER  RED/LIGHT BLUE (+)  @ IGNITION SWITCH HARNESS
 STARTER 2  N/A  
 IGNITION 1  WHITE/YELLOW (+)  @ IGNITION SWITCH HARNESS
 IGNITION 2  PINK/BLACK (+)  @ IGNITION SWITCH HARNESS
 IGNITION 3  N/A  
 ACCESSORY/HEATER BLOWER 1  GRAY/YELLOW (+)  @ IGNITION SWITCH HARNESS
 ACCESSORY/HEATER BLOWER 2  BLACK/GREEN (+)  @ IGNITION SWITCH HARNESS
 KEYSENSE  N/A  
 PARKING LIGHTS ( - )  WHITE/BLACK (-)  @ LCM, GREY 16 PIN Plug, Pin 13, See NOTE #2
 PARKING LIGHTS ( + )  BROWN (+)  @ LCM, BLACK Plug, Pin 4, See NOTE #2
 POWER LOCK  PINK/YELLOW (TYPE C), See NOTE #3  IN DRIVERS DOOR HARNESS
 POWER UNLOCK  PINK/LIGHT GREEN (TYPE C), See NOTE #3  IN DRIVERS DOOR HARNESS
 DOOR TRIGGER  DARK BLUE (-) and BLACK/ORANGE (-) Use both, See NOTE #5  @ LCM Module, See NOTE #2
 DOMELIGHT SUPERVISION  DARK BLUE (-) (Requires #775 relay)  @ LCM Module, See NOTE #2
 TRUNK RELEASE  PURPLE/YELLOW, See NOTE #4  IN DRIVERS DOOR HARNESS
 SLIDING POWER DOOR  N/A  
 HORN  DARK BLUE (-)  @ STEERING COLUMN HARNESS
 TACH  Any wire that is NOT RED or RED/LIGHT GREEN (AC)  @ IGNITION COIL or FUEL INJECTOR
 WAIT TO START LIGHT  N/A  
 BRAKE  LIGHT GREEN (+)  @ SWITCH ABOVE BRAKE PEDAL
 FACTORY ALARM DISARM   N/A  
 ANTI-THEFT  FORD'S TRANSPONDER ANTI-THEFT SYSTEM, See NOTE #1  @ IGNITION SWITCH TUMBLER
 EXTRA INFORMATION
 NOTE #1: This vehicle is equipped with a Special Anti-theft key, to remote start you will need a Bypass module 791, use this module IF you have a extra ignition key to place inside the 791 to remote start, if you do not have an extra key to use or wish not to have a key placed inside this bypass module, we OFFER a KEYLESS INTERFACE BYPASS MODULE that does not require a key to be placed inside the bypass module, this is Part # PKALL or PKFM, either one will work, to order, go to the INTERFACE BYPASS MODULE PAGE on this website. NOTE #2; the LCM (Lighting Control Module) is located to the right of the steering column. You can get to the harness of the LCM between the steering column and the LCM Module. NOTE #3: If vehicle is equipped with a FACTORY KEYLESS ENTRY System, then the vehicle has a TYPE B Door Locking System, vehicles without FACTORY KEYLESS ENTRY, have a TYPE C Door Locking System. Vehicles with the KEY PAD on the Door are considered to have KEYLESS ENTRY. NOTE #4: this vehicle uses a 5-wire TRUNK Release System that requires an extra relay part #775, to connect, See DIAGRAM NOTE #5: when connecting to an ALARM SYSTEM, use both DOOR TRIGGER wires and DIODE ISOLATE, to connect, See DIAGRAM
 
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